Hi All

I have modelled a shell surface for a modal acoustic analysis. but run exits with this error , how should I resolve it ?

All nodes of the elements attaching to PML interface with the PML

element coordinate system number 0 have zero pressure constraint for

the acoustic element FLUID30, FLUID220 or FLUID221. Please check the

constraint applied on the PML elements. This error may also be caused

by the connectivity of FEA model. Using the NUMMRG command may avoid

the error.

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